I have a Windows 10 laptop that rarely gets shutdown. Instead of shutting down, I put the machine to sleep. S3D is the primary application and it is RARELY not running.

Something appears to be causing S3D to adjust it's windows size and it's placing the main window over the title bar. This prevents me from minimizing/maximizing the application. As you can see below, the main window has been placed over the top of the title bar so all of the form controls are missing. There is also a gap at the bottom of the window where the window should be sized to touch the taskbar, but there is a title bar sized gap.

This isn't too big of a deal -- you can resize the window and the title bar pops back. If I do that, I can snap the window back to the left side of the display and everything looks good -- title bar is back and the gap is no longer there.

I took the two images and put them together to show the difference...

Once the application is "stuck" like this, I believe the fix is to dock it to the right side of the monitor and then undock it. Otherwise it continues to open without the title bar even after restarting the application.

I understand this is a really low priority bug... but I did want to pass it on! It isn't new with 4.1, I see the same behavior in 4.0.

I think you may have accidentally dragged the Simplify3D window title bar off-screen.

To get it back, hold down the Shift key and right-click on its icon in the Taskbar.

This will pop up a few options that will allow you to get the title bar back onto your screen.

The options unavailable will be greyed-out. Click on "Maximise" makes it fit the full-screen so you can get to the controls, or "Move" (the cursor changes to a cross-arrow) and move the mouse up to what you can see that is left of the title bar, left-click-hold, and drag the controls back onto the screen.